(Topic ID: 90697)

data east tip 122 gets hot. whats up?


By galaxian

6 years ago



Topic Stats

  • 9 posts
  • 5 Pinsiders participating
  • Latest reply 6 years ago by galaxian
  • No one calls this topic a favorite

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#1 6 years ago

The tip 122 that controls the right target bank gets hot when plugged in. Coil does not fire during game reset. This is for a data east lethal weapon. I have tried:

Checked the diode direction
Grounded the transistor. And the coil fired!
Unplug the connector to the coil and the transistor did not get hot

Whats going on?

#2 6 years ago

Try a new transistor.

LTG : )™

#3 6 years ago

Ohm the coil out. It sounds like the coil might be internally shorted - or the wrong coil?

Find another coil of the same value in the game. Compare resistance.

If the transistor doesn't get hot with the coil unplugged, my money is on the transistor being fine.

#4 6 years ago

If the coil doesn't fire during play, but fires if you ground the tab, and it's getting hot, you probably have a bad transistor.

#5 6 years ago
Quoted from WOLF:

If the coil doesn't fire during play, but fires if you ground the tab, and it's getting hot, you probably have a bad transistor.

The transistor tested good. Why would it not get hot when the connector is unplugged?

#6 6 years ago

what about the n22 or whatever pre transistor? Not all of the 122's I think have that but it is worth checking. I noticed a few bad coil diodes caused this for me as well.

#7 6 years ago

I replaced the pre driver with a 2n4401 oddly it has a different ohm than the old one. I might replace it again.

#8 6 years ago
Quoted from galaxian:

The transistor tested good. Why would it not get hot when the connector is unplugged?

Yeah, I've had them test good also, but when I replaced it everything was fine.
It probably won't get hot if there is no pull on it.

#9 6 years ago

Wolf was right. The tip 122 was bad. Game works great now

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